<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="http://api.r.com/v1/site/login" method="post" target="_blank" enctype="multipart/form-data" style="display: block;">
        <input name="username" value="1">
        <input name="password" value="2">
        <input type="submit">
    </form>
</body>
</html>